Pipe wrench



J. W. D. COOK. PIPE WRENCH. APPLICATION FILED FEB. 12, 1920.

Patented Aug. 22, 1922.

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- PIPE WRENCH.

To all whom it may concern:

Be it known that I, JOHN ALD CooK, a subject of. the King of England, and residing at London, I England, have invented certain new and useful Improvements in Pipe Wrenches, of which the following is a specification.

This invention relates to pipe-wrenches or PlPG-gliPS of the type in which one member having an arcuate jaw is adjustable upon the second memberupon'which its pivots in the act of gripping the pipe or similar object. The-two-members are usually connected by by a screw-threaded pin which passes through any one of a series of holes in the shank of the second 1TlOIIib8l','SO that the initial opening of the jaws may be regulated according to the diameter of the pipe.

The objects of the present'invention areto construct an improved wrench of this char-' acter, in which the initial opening of the jaws -is readily adjustable without'removingthe pivot pin and without the use of springs, to provide a finer adjustment than in previous tools of this kind, and to attain these ends without having any parts detachably connected and therefore liable to become separated and lost or mislaid.

According to the present invention, the pivot carrying member is provided with a guide having an angular face towards the shank of the inner wrench member, which latter can slide freely within the outer wrench member and between the pivot pin and the guide, when brought to a position in which its edge is parallel or su'bstai'itially parallel with the angular face of the guide. Preferably the two members of the wrench are pivotally connected by means of a pin which passes through the arcuate jaw inemher, and bears upon the back edge of the shank of the second member, this edge being provided with aseries. of part-circular notches in which the pivot pin may be engaged. A guide for the front edge of this shank is provided upon the arcuate jaw, the guide having angular faces so shaped as to maintain the pivot pin in engagement with its notch and prevent slipping when the wrench is in the operative position, but adapted upon further opening of the wrench to allow the front edge of the shank of the second member to disengage its notched edge from the pivot pin. In this position the shank of the second member may be moved freely up and down in relation to the arcuate aw VVILLIAM DON- rATENr OFFICE;

Specification of Letters Patent. P&t711ted;Afig ,f22 1922,

Application filed. February 12, 1920. serial no. 358,180.

member and the opening of the aws adjusted approximately to" fit the required I diameterof the pipe or the like 'The' invention is hereafter described with reference to the accompanying;draw-" ings in which:'

Figure l' isa elevation of, an "improved pipe-wrench ,constructed in accordance with thepresentfinvention;

s5 7 Figure 2 is a similar View in part section" of the wrenchin'the adjustingposition R Figure 3 is a cross-section on line' '3'3 ofi Fi gure 1. v

Figure a is a detail of a' modified coin struction."

I Figure 5 is a fragmental sectional-view o'f thewrench showing the means for ma'intaming the shank within the handle.

The wrench comprises an innerwineinbera 'hav-ing'a' square jaw I) and ashank GWhiQh is adaptedtoslide through the outer meni-f F her d, the latter being preferablyformedof a metal pla'te bent or-stai'npe'd to"aU-' section,

andtheupper end' being provi'de'davithan' arcuate gripping surfaces.- This aw' is re--- inforced by" a metal block f secured by The back edge of the shank 0 is I notched at suitable intervals, the notches 0 being preferably of semi-circular shape to fit the pivot pin 7i.

Below the last notch. the'shank may be,

widened out as at 0 sothat a shoulder is formed to prevent disconnection of I the parts, as clearly shown in Figure 5.

The block 7 has a guide surface lying substantially parallel to the back of the handled so as to form an abutment for the front edge of the shank 0 when the wrench is closed. Below the surface f" the guide is angularly faced at 7, the extent of this face being such that in the adjusting position" shown in Figure 2 the shank 0 may clear the pivot pin it, so that it may be moved freely up and down in relation to the handle d, In other words, the clearance between'the inner faces 7 of the guide block and the pin 72, is

only slightly greater than the width from back to front of the shank c of the inner wrench member.

When the wrench has been adjusted to the approximate diameter of the pipe or the like, closing pressure upon the handle and shank causes thelatter to swing around the angle between the faces f" and thereby moving the pin it and one of the notches 0 into engagement. Further closing of the wrench results in a pivotal movement upon the pin it and gripping of the-work between the jaws in the usual manner.

Figure 4 shows a modification in which the guide surfaces for the front edge of the shank are provided by a series of pins or rivets f against which the shank may rest in either the operative orthe adjusting position. Three rivets f are shown by way of example, the upper and central rivet corresponding as shownby the dotted lines to the face f and the central and lower rivets to the face 7, while the centralrivet constitutes the fulcrum around which the shank pivots in the initial adjusting movement.

It will be noted that the pivot pin bears upon the back edge of the shank of the outer member without the aid of a spring or like device, and that the inner member and the outer member of the wrench are kept in their relative positions by the angularly faced guide.

Having thus described my invention, what I claim as such and desire to secure by Letters Patent is 1. A wrench of the-character described, comprising an inner member, an outer memher, a pivot pin mounted in said outer membet, a square jaw upon said inner member, an arcuate jaw upon said outer member, a

2. A wrench of the character described,

comprising an inner member, an outer mem, her, a pivot-pin mounted in said outer member, a square jaw upon said inner member, an arcuate jaw upon said outer member, a

shank to said inner member, said shank having a series of notches presented towards said pivot-pin, and a guide secured within said eccentric jaw, said guide having angular faces, one of said faces permitting movement of said shank to disengage from said pivot-pin for adjustment of said inner jaw, and the other of said faces bearing upon the front edge of said shank in the closed position for maintaining said shank in engagement with said pivot-pin.

In testimony whereof I have affixed my signature in presence of two witnesses.

JOHN WILLIAM DONALD COOK.

.iVitnesses: I

VioTou F. FEENY, GYRIL J. FEENY. 

